- Give object dialogs a bigger default size and hide the column headers

	* gladeui/glade-signal-editor.c:
	  - Now show an icon and tooltip in rows for signals that are only
	    supported in the future, refresh them when support changes.

	* gladeui/glade-widget-adaptor.h, gladeui/glade-property-class.h: Added some version checking macros.

	* gladeui/glade-signal.[ch]: Add support warning meta data to signals

	* gladeui/glade-project.c:
	  - Simplify code with new version checking macros
	  - Do the verify on signals for widgets as well as project warnings
	    (update the signals a verify time).

	* gladeui/glade-widget.c: GladeWidget takes a new "support-changed" to broadcast support changes
	  on the widget.

	* gladeui/glade-signal-editor.c: